#include<bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
const int N=2e5+10;
#define INF 0x3f3f3f3f;
typedef long long int ll;
#define close(); std::ios::sync_with_stdio(false);cin.tie(0),cout.tie(0);
//----------------------------------------------------------------------------//

void solve()
{
	string s;
	cin>>s;
	map<char,int> cnt;
	for(auto&k:s) cnt[k]++;


	for(auto[k,v]:cnt)
	{
		if(v==2) cout<<k<<k;
		else if(v==0) continue;
		else if(v==1) cout<<k;
	}
	cout<<'\n';


	
}

int main()
{
	close();
	int T; cin>>T;
	while (T--) solve();

	return 0;
}